Newcastle are set to confirm the arrival of Brazilian winger Kenedy from Chelsea on a season's loan before the weekend, but after that, Benitez knows he will have to sell players before he can make any more signings.
Ex-Newcastle midfielder Joey Barton joined in the Benitez-baiting - telling the Spaniard to stop moaning and start coaching after owner Mike Ashley failed to live up to his transfer window promises.
He insisted the best way to lift spirits at St James' Park is to start winning games.
The 26-year-old moved to Palace in the summer of 2016, for a fee that could eventually rise to £32 million, and went on to impress for the south London outfit, scoring 15 goals in 38 Premier League outings to date.
"It's because we didn't win, that's it". If you think the approach of the first game against Tottenham will change if I am smiling or not, it will be the same. If you win, everyone is happy.
"If we win, I will be happy.
With the injuries and the results, we're not getting the rub of the green but that's the Premier League, you get punished for anything, that's the difference between that and the Championship".
Tim Krul, Achraaf Lazaar, Massadio Haidara, Grant Hanley, Jack Colback, Henri Saivet and Emmanuel Riviere are among the players being considered for moves away having been told they will not be considered for selection this season. The majority of the players were working with us previous year and know how we work.
"We are expecting players to come", he added.
"The window has been so hard that we have too many players around and that's not an easy situation".
'Obviously we lost, which at the end is what counts, but in terms of the organisation of the team and the work-rate, then we are fine.